Method and arrangement for charging intermediate circuit of...

Details Method and arrangement for charging intermediate circuit of... Method and arrangement for charging intermediate circuit of...

2006-01-31

2006-01-31

Berhane, Adolf (Department: 2838)

Electric power conversion systems

Frequency conversion without intermediate conversion to d.c.

By semiconductor converter

Reexamination Certificate

active

06992908

ABSTRACT:
A method and arrangement for charging an intermediate circuit of a frequency converter, the intermediate circuit of the frequency converter comprising one or more capacitors, and the frequency converter having means for charging the intermediate circuit, the means comprising a rectifier bridge, a direct current choke, a direct-current transformer, a zero diode, and a semiconductor switch and a control circuit arranged to control the switch. The method comprises the steps of defining in advance high and low current limits, controlling the semi-conductor switch alternately to conductive and non-conductive states depending on the magnitude of a charging current, and stopping the controlling of the semiconductor switch when the charging current remains below the high current limit.

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Patent Abstracts of Japan, of JP 04307437 (Toshiba Corporation), dated Jun. 10, 1994, entitled “Power Conversion Apparatus”.

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